{"id":297,"date":"2025-05-12T17:41:18","date_gmt":"2025-05-12T08:41:18","guid":{"rendered":"https:\/\/yowamon3.com\/?p=297"},"modified":"2025-05-12T17:41:18","modified_gmt":"2025-05-12T08:41:18","slug":"%e3%82%bb%e3%83%ac%e3%82%af%e3%83%88%e3%83%9c%e3%83%83%e3%82%af%e3%82%b9%e3%81%ae%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/yowamon3.com\/?p=297","title":{"rendered":"\u30bb\u30ec\u30af\u30c8\u30dc\u30c3\u30af\u30b9\u306e\u64cd\u4f5c"},"content":{"rendered":"\n

\u524d\u63d0<\/h2>\n\n\n\n

\u30bb\u30ec\u30af\u30c8\u30dc\u30c3\u30af\u30b9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3082\u306e\u3068\u3059\u308b\u3002<\/p>\n\n\n\n

<select id="my-select">\n<\/select><\/code><\/pre><\/div>\n\n\n\n
\u9805\u76ee\u306e\u8ffd\u52a0<\/h2>\n\n\n\n
const select = document.getElementById('my-select');\n\nconst newOption = document.createElement('option');\nnewOption.value = '1'\nnewOption.text = 'One'\n\nselect.appendChild(newOption)<\/code><\/pre><\/div>\n\n\n\n
\u9805\u76ee\u306e\u524a\u9664<\/h2>\n\n\n\n
const select = document.getElementById('my-select');\n\nwhile(select.children.length > 0) {\n    select.removeChild(select.lastChild);\n}<\/code><\/pre><\/div>\n\n\n\n
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const select = document.getElementById('my-select');\n\nwhile(select.children.length > 1) {\n    select.removeChild(select.lastChild);\n}<\/code><\/pre><\/div>\n\n\n\n
\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u8981\u7d20\u3060\u3051\u3092\u524a\u9664<\/h3>\n\n\n\n
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const select = document.getElementById('my-select');\n\nfor(let i = select.options.length - 1; i > 0; i--) {\n    const option = select.options[i];\n    if(option.value.includes('\u524a\u9664')) {\n        select.remove(i);\n    }\n}<\/code><\/pre><\/div>\n\n\n\n
\u9805\u76ee\u306e\u9078\u629e<\/h2>\n\n\n\n
\u5148\u982d\u306e\u8981\u7d20\u3092\u9078\u629e<\/h3>\n\n\n\n
const select = document.getElementById('my-select');\n\nselect.selectedIndex = 0;<\/code><\/pre><\/div>\n\n\n\n
\u7279\u5b9a\u306e\u5024\u3092\u6301\u3063\u305f\u8981\u7d20\u3092\u9078\u629e\u3057\u305f\u3044\u5834\u5408<\/h3>\n\n\n\n
select.value\u306b\u4ee3\u5165\u3059\u308b\u5024\u306f\u9078\u629e\u3057\u305f\u3044\u9805\u76ee\u306evalue\u3092\u8a2d\u5b9a\u3059\u308b\u3002\u4ee5\u4e0b\u306e\u4f8b\u306e\u5834\u5408\u3001value\u304c\u7a7a\u6587\u5b57\u306e\u9805\u76ee\u304c\u9078\u629e\u3055\u308c\u308b\u3002<\/p>\n\n\n\n
const select = doucment.getElementById('my-select');\nselect.value = '';<\/code><\/pre><\/div>\n\n\n\n
\u8907\u6570\u9078\u629e\u53ef\u80fd\u3068\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u5148\u982d\u9805\u76ee\u306e\u307f\u9078\u629e\u3055\u305b\u305f\u3044<\/h3>\n\n\n\n
\u8907\u6570\u9078\u629e\u53ef\u80fd\u306a\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u5148\u982d\u8981\u7d20\u306e\u307f\u3092\u9078\u629e\u3057\u305f\u72b6\u614b\u306b\u3067\u304d\u308b\u3002\u3059\u3079\u3066\u306e\u9078\u629e\u3092\u89e3\u9664\u3057\u305f\u3044\u5834\u5408\u306f\u5358\u7d14\u306bfalse\u3092\u4ee3\u5165\u3059\u308c\u3070\u3088\u3044\u3002<\/p>\n\n\n\n
const select = document.getElementById('my-select');\n\nArray.from(select.options).forEach((opt, index) => {\n  opt.selected = (index === 0);\n});<\/code><\/pre><\/div>\n\n\n\n
\u9078\u629e\u3055\u308c\u305f\u5024\u306e\u53d6\u5f97<\/h2>\n\n\n\n
\u9078\u629e\u3067\u304d\u308b\u306e\u304c1\u9805\u76ee\u306e\u5834\u5408<\/h3>\n\n\n\n
const select = document.getElementById('my-select');\n\n\/\/ \u9078\u629e\u3057\u305f\u9805\u76ee\u306evalue\u3060\u3051\u53d6\u5f97\u3067\u304d\u308c\u3070\u826f\u3044\u5834\u5408\nconst selectedValue = select.value;\n\n\/\/ \u9078\u629e\u3057\u305f\u9805\u76ee\u306e\u30c6\u30ad\u30b9\u30c8\u3082\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\nconst selectedOption = select.options[select.selectedIndex];<\/code><\/pre><\/div>\n\n\n\n
\u8907\u6570\u9078\u629e\u53ef\u80fd\u306a\u5834\u5408<\/h3>\n\n\n\n
const select = document.getElementById('my-select');\n\nconst selectedValues = Array.from(select.selectedOptions).map(opt => opt.value);<\/code><\/pre><\/div>\n\n\n\n
onChange\u30a4\u30d9\u30f3\u30c8<\/h2>\n\n\n\n
\u7121\u540d\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u5834\u5408<\/h3>\n\n\n\n
document.getElementById('my-select).addEventListener('change', (e) => {\n  \/\/ \u51e6\u7406\u3092\u66f8\u304f\n});\n<\/code><\/pre><\/div>\n\n\n\n
HTML\u3067\u5b9a\u7fa9\u3059\u308b\u5834\u5408<\/h3>\n\n\n\n
<select id="my-select" onChange="handleMySelectOnChange()">\n<\/select><\/code><\/pre><\/div>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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